Tom Olzak

Security Note: New method for detecting forgeries

In Forgery on October 9, 2009 at 08:53

A new visualization approach to detecting forgeries was presented this summer at EuroVis 2009.  Songhua Xu demonstrated how pen angle and pressure provides enough information to determine if a signature, for example, is a forgery.


In this image, the signatures at the top are genuine.  It is easy to see that what Songhua Xu calls the “lilly” is different and inconsistent on the bottom, forged examples.  Supposedly, any forgery is easily detectable no matter how close it “looks” to genuine one.

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